Tutorials List


The method acos() returns the arc cosine of x, in radians.


Following is the syntax for acos() method ?


Note ? This function is not accessible directly, so we need to import math module and then we need to call this function using math static object.


  • x ? This must be a numeric value in the range -1 to 1. If x is greater than 1 then it will generate an error.

Return Value

This method returns arc cosine of x, in radians.


The following example shows the usage of acos() method.

import math

print "acos(0.64) : ",  math.acos(0.64)
print "acos(0) : ",  math.acos(0)
print "acos(-1) : ",  math.acos(-1)
print "acos(1) : ",  math.acos(1)

When we run above program, it produces following result ?

acos(0.64) :  0.876298061168
acos(0) :  1.57079632679
acos(-1) :  3.14159265359
acos(1) :  0.0